ABB TPU2000 Technical Manual page 365

Figure 5. Modbus Plus Network Topology MSTR Read Instruction Example
A sample Ladder Logic Instruction network is given in Figure 6. The ladder logic is included for instruction
purposes only. The MSTR instruction is energized by internal coil 00107. If the instruction is active, coil 00102
energizes to request the information from the ABB protective relay. If the block is parameterized incorrectly, coil
00103 will energize and register 400101 will contain a non-zero number indicating the fault type. If the Ladder
Logic instruction obtains the information from the relay, output coil 00104 shall energize indicating completion of
the network access. Also within this network example, an counter will increment each time a successful network
communication occurs. This count, contained in the PLC memory 400109 can serve as a heartbeat counter to
monitor continuous and successful communications.
TPU2000/2000R Modbus/Modbus Plus Automation Guide
Modicon Compact PLC
MSTR
Address 1
Read Power Information
Response From Relay
40110 - kWatts A High 16 bits
40110 - kWatts A Low 16 bits
40111 - kWatts B High 16 bits
40112 - kWatts B Low 16 bits
40113 - kWatts C High 16 bits
40114 - kWatts C Low 16 bits
40115 - kWatts Three Phase High
40116 - kWatts Three Phase Low
40117 - kVars A High 16 Bits
40118 - kVars A Low 16 Bits
40119 - kVars B High 16 Bits
40120 - kVars B Low 16 Bits
40121 - kVars C High 16 Bits
40122 - kVars C Low 16 Bits
40123 - kVars Three Phase High
40124 - kVars Three Phase Low
40125 - SPARE REGISTER
:
40139 - SPARE REGISTER
Figure 6. MSTR Ladder Logic Network Example
ABB DPU2000R
Modbus Slave Addr =10
C
E
Read from
4X Mapping
40283 - kWatts A High 16 bits
40284 - kWatts A Low 16 bits
40285 - kWatts B High 16 bits
40286 - kWatts B Low 16 bits
40287 - kWatts C High 16 bits
40288 - kWatts C Low 16 bits
40289 - kWatts Three Phase High
40290 - kWatts Three Phase Low
40291 - kVars A High 16 Bits
40292 - kVars A Low 16 Bits
40293 - kVars B High 16 Bits
40294 - kVars B Low 16 Bits
40295 - kVars C High 16 Bits
40296 - kVars C Low 16 Bits
40297 - kVars Three Phase High
40298 - kVars Three Phase Low
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